Preparation:Preheat oven to 350 degrees. Cut the rolls in half. Place the bottoms of the rolls in a 913 pan that has been sprayed with cooking spray. Place a little roast beef and then cheese over the bottom of the rolls. Sprinkle bacon on top of each. Put the tops on the rolls. Melt the butter. Add the dry Ranch and horseradish if using. Whisk and then evenly pour over the rolls. Cover dish with foil. Bake covered for 15 minutes. Remove foil and bake an additional 8 to 15 minutes or until just golden on top. Serve warm!